Alec Baldwin has reprised in his role as Donald Trump for the latest episode of Saturday Night Live’s Weekend Update, identifying the US president as the true martyr of the tragic Charlottesville rally.

A 12-year-old singing ventriloquist has been awarded US$1 (A$1.3) million prize and her own Las Vegas show after taking the America's Got Talent crown on the season 12 finale of the NBC reality competition.

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New stereo speakers will put out twice the volume of the iPhone 6 and 6 Plus, Cook said.

The home button has also been re-designed and the display will be 25 percent brighter.

Orders for the iPhone 7 will open on Friday and shipping starts September 16.

Cook also unveiled the Apple Watch Series 2, which has a dual core processor, watchOS 3, a brighter display, water-resistant technology and GPS.

The watch has new interfaces, the ability to make messaging "more expressive" including writing custom replies with a scribble, new health apps and a new safety feature allowing users to call emergency services by holding a button at the side of the watch.

“Apple Watch has really changed what people expect from a watch,” Cook said.

"It is faster. It is brighter. It is water resistant so you can swim with it. It has built in GPS…It's also built according to our strict environmental standards.

"We think Apple Watch is the ultimate device for healthy life."

Niantic, the company behind Pokémon Go, also announced it will make the app available on Apple Watches.

The company's update will notify players when a Pokémon is nearby and will also allow them to check their progress within the game.

Cook said the App Store was also getting a shake-up, with gaming the biggest and most popular category.

He announced Nintendo’s famous Mario game is coming to iOS, in the form of "Super Mario Run".

Just hours before the launch, Amazon accidentally released a page of new iPhone 7 accessories depicting one iPhone with the rumoured dual back-facing cameras.

Apple has maintained a rhythm of introducing updated iPhone models on an annual basis, timing introductions to coincide with the holiday shopping season.

In July, the company announced the sale of its billionth iPhone, a milestone for the company as it seeks to keep momentum in a competitive smartphone market.

"We see a large opportunity for the iPhone 7 when we consider the potential number of upgraders coming from the iPhone 6 and 6 Plus," Kantar Worldwide ComTech consumer insight director Lauren Guenveur said.

"Virtually all of those who intend to upgrade have told us they will remain loyal to Apple, making the iPhone 7 an obvious choice."

Apple reported a drop in iPhone sales in the second quarter of this year - its second consecutive drop after uninterrupted growth since its introduction in 2007.

Today's presentation came as Apple squared off with the European Union over a demand that it pay a record 13 billion euros ($14.5 billion) in back-taxes in Ireland.

Apple has vowed to fight the tax bill and has won support from Ireland's government. But the Eurozone member's opposition has lashed out at a cabinet decision to appeal the EU ruling.

"We want companies like Apple in Ireland... but this doesn't mean one should turn a blind eye to tax evasion or avoidance," Sinn Fein leader Gerry Adams said in parliament.

The ruling put Ireland in the strange position of refusing the windfall for fear of scaring away valuable investment and undermining what has been a cornerstone of Ireland's economic policy for decades.